Sweep: install react into the repo, modify the readme with the instalation method (✓ Sandbox Passed)

[jackeldestripat]

Description

This pull request adds the React library to the test-sweep-locally repository, as well as modifies the README with instructions on how to install and use React.

Summary

• [x] Installed react and react-dom in src/index.js
• [x] Updated package.json with the necessary dependencies
• [x] Modified the README file with installation instructions for using React in this project.

Fixes #36.

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[jackeldestripat]

Rollback Files For Sweep

• [ ] Rollback changes to src/package.json
• [ ] Rollback changes to src/index.js
• [ ] Rollback changes to README.md

[jackeldestripat]

Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.